You've kinda got it mixed up. An AFC is a controller, WBO2's and 3Bars are sensors.
The AFC goes inbetween the sensors and the computer and modifies what the comptuer sees. For example, if the voltage output from the MAP sensor is 3V, the AFC recieves that 3 volts, and modifies it to what you think it should be. This will alter what the ECU puts out for injector pulsewidths based on the STOCK tables. Confusing the computer will leave you with the same map you had before.
A wideband O2 sensor is an oxygen sensor with a linear output over the air fuel ratio ranges. This is different than a narrowband O2 sensor, which has a nonlinear output, genearlly centered around the 14.7 ratio. The WBO2 sensor allows you to accurately see what your air fuel ratio is. With that information, you'll use your AFC, calibration, or whatever tuning you'd like (MAP clamp, AFPR, RRFPR, bigger injectors, extra injectors, the list goes on and on and on) to modify your tune and put it in the range that will make the most power.
A MAP sensor is again, another sensor. Using this sensor you can find the pressure in the intake manifold. You can kind of use it to tune by (again) confusing the computer with bigger injectors to compensate for the way a 3bar behaves compared to a 2bar that comes stock. This is a bad idea though.
I reccomend against an AFC because you are only dealing with the stock maps. Check out D-cal and the CHem projects around here before getting an AFC. These actually modify the stock binaries.to accept 3bar map sensors and bigger injectors. You can also modify the tables to alter the spark and fuel curves. No matter how much you play with the AFC you can't mess with the spark tables. Xtreme is right, you can pull or add fuel in custom calibrations, but whe you can make your own custom calibrations for cheaper than the AFC, why even consider it?
None of these care if you have a wideband or a narrowband. You simply can't know what's going on with a narrowband. If it's worht blowing up your engine for, go ahead and skip the WB. I know it says it's OK on donovans page, I know a lot of people do it, but a wideband is only $200 (compared to a narrowband lightshow gauge for $50), and it really is so much more accurate. It's not the 1v vs. the 5v, it's that the narrowband is not linear (as you get further away from 14.7 accuracy drops dramatically), while wideband is linear (accuracy is exactly the same from AFR 7-22).
Narrowband;
http://www.stealth316.com/images/o2sensor-output.gif
Wideband;
http://www.plxdevices.com/M-Series-C...utputGraph.jpg
TurboDodge.com 
. Seriously, D-Cal + LM-1 WB/Logger = good idea. AFC + NB = bad idea. 
